Implement TrackExtractor for Spotify Track Data Extraction

[Copilot]

This PR implements the TrackExtractor class for extracting comprehensive track data from Spotify web pages, including metadata, preview URLs, and synchronized lyrics.

Features Implemented

• Extract track metadata (name, ID, URI, duration, artists, album details)
• Extract preview URLs and playability status
• Extract synchronized lyrics with timing information when available
• Handle both regular and embed Spotify URLs seamlessly
• Support URL validation and conversion between formats

Implementation Details

• Created a modular architecture with separation of concerns:

  • TrackExtractor - Main class that orchestrates the extraction process
  • Browser - Abstract interface for making web requests
  • Helper utilities for URL validation and JSON parsing
  • Type definitions for structured data representation

• Added robust error handling for:

  • Invalid URLs
  • Non-existent tracks
  • JSON parsing errors
  • Content extraction failures

Testing

All tests pass with 96% code coverage for the extractor module. Tests verify:

• Extraction from valid URLs (both regular and embed formats)
• Proper URL validation
• Error handling for non-existent tracks

Example Usage

from spotify_scraper.browsers.requests_browser import RequestsBrowser
from spotify_scraper.extractors.track import TrackExtractor

# Create a browser instance
browser = RequestsBrowser()

# Create a track extractor
extractor = TrackExtractor(browser)

# Extract track data
track_data = extractor.extract("https://open.spotify.com/track/4u7EnebtmKWzUH433cf5Qv")

# Access extracted data
print(f"Track: {track_data.name}")
print(f"Artist: {track_data.artists[0].name}")
print(f"Preview URL: {track_data.preview_url}")

# Get synchronized lyrics if available
if track_data.lyrics:
    for line in track_data.lyrics:
        print(f"{line.start_time_ms}ms: {line.text}")

Fixes #18.

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